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| 基于改进型Transformer网络的高阶QAM调制分类研究 |
| Research on classification of high order QAM modulation with improved Transformer network |
| 投稿时间:2023-02-26 |
| DOI:10.3969/j.issn.1005-5630.202302260027 |
| 中文关键词: QAM 智能通信 Transformer 网络 AWGN信道 自动调制分类 |
| 英文关键词:QAM intelligent communication Transformer network AWGN channel automatic modulation classification |
| 基金项目:国家自然科学基金 (61805144) |
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| 中文摘要: |
| 针对高阶正交振幅调制(quadrature amplitude modulation,QAM)信号难以调制分类的问题,提出了一种基于改进型Transformer的深度学习调制分类方法,通过并行2个Transformer的编码器,分析了在加性高斯白噪声(additive white Gaussian noise,AWGN)信道下,从4 QAM到4 096 QAM的10种调制格式在信噪比从-10 dB到30 dB的自动调制分类效果。首先将QAM信号的正交、同相分量提取出来并进行预处理操作,再将预处理过的同相分量和正交分量分别通过2个Transformer编码器来提取分量特征,最后将2个提取到的分量特征进行组合来判断QAM信号的调制格式。实验结果证明:在没有载波频率偏移影响且信噪比大于20 dB时,网络可以准确识别出10种QAM调制格式;在载波频率偏移为500 Hz且信噪比大于26 dB时,网络对10种QAM调制格式的分类准确率高于98.6%。 |
| 英文摘要: |
| In communication systems, the modulation classification of high order quadrature amplitude modulation signals is a difficult problem. An improved Transformer deep learning modulation classification method is proposed in this paper. The network parallelizes two Transformer encoders. In the additive Gaussian white noise channel, the automatic modulation classification effect of 10 modulation formats ranging from 4 QAM to 4 096 QAM with SNR ranging from -10 dB to 30 dB was analyzed. First, the quadrature and in-phase components of the QAM signal were extracted and preprocessed. Then the preprocessed in-phase component and quadrature component pass through two Transformer encoders to extract component features. Finally, the two extracted component features were combined to judge the modulation format of the QAM signal. The experimental results prove that the network can accurately identify 10 kinds of QAM modulation formats when there is no influence of carrier frequency offset and the signal-to-noise ratio is greater than 20 dB. When the carrier frequency offset is 500 Hz and the signal-to-noise ratio is greater than 26 dB, the classification accuracy of the 10 kinds of QAM modulation formats is higher than 98.6%. |
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